NEW BRUNSWICK — New Brunswick police are seeking a man who sexually assault one girl and engaged in lewd conduct with another in their Somerset Street home early today.

The man — described as Hispanic with a thin build, about 40 years old, and with a thick mustache — entered the girls' second-floor apartment about 8:30 a.m., Middlesex County Prosecutor Bruce Kaplan said in a statement. The intruder then went into the girls' bedroom and then sexually assaulted one girl, Kaplan said.

He said the man then engaged in lewd behavior with the other girl.

The man fled when one of the girls called for help, contacting police, Kaplan said the statement issued jointly with New Brunswick Police Director Peter Mangarella.

The man was wearing a black baseball-style cap with the letters AB in white, a white T-shirt, black pants and black sneakers. He was wearing a silver wristwatch on his left wrist, authorities said.

Anyone with information is asked to call Investigators James Kelly of the prosecutor's office at (732) 745-3600, or New Brunswick police Detective Daniel Dominguez at (732) 745-5200.